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Polymer-encapsulated pigment with passivation layer

a polymer-encapsulated pigment and passivation layer technology, applied in the field of polymer-encapsulated pigments with passivation layer, can solve the problems of nozzle and ink channel blockage, special difficulties in maintaining appropriate dispersion stability, and many polymer-encapsulated pigments are not very compatible with thermal ink-jet architectur

Inactive Publication Date: 2008-10-16
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to improving the stability and performance of polymer-encapsulated pigments in thermal ink-jet printing. The technical effects of this invention include providing methods, polymer-encapsulated pigments, inks, ink sets, and systems that can better adapt to the thermal ink-jet architecture and provide better print durability and colorant performance. The invention also addresses the difficulty of maintaining appropriate dispersion stability of polymer-encapsulated pigments in thermal ink-jet inks. The invention provides passivation components that can change solubility upon adjustment of pH, allowing for improved polymerization and more effective use of the pigments in thermal ink-jet printing.

Problems solved by technology

With specific reference to pigment-based ink-jet inks, latex-containing ink-jet inks, and / or polymer-encapsulated pigments, there are special difficulties associated with maintaining appropriate dispersion stability, especially when the ink is to be jetted from a thermal ink-jet architecture.
While certain encapsulation methods and chemistries are known, many polymer-encapsulated pigments are not very compatible with thermal ink-jet architecture.
For example, these polymer surfaces can tend to cause pigments to either agglomerate under the high thermal shear conditions of the architecture firing chamber, causing nozzle and ink channel blockages, or have excessive glass transition temperatures that prevent room temperature print film formation.
Thus, incorporation of such polymer encapsulated pigments within thermal inkjet inks either results in pen reliability reduction or poor print durability colorant performance, respectively.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

on of a Silica Passivation Layer

[0040]Carbon black pigment (Printex 25 from Degussa Corporation) is mixed with the non-ionic surfactant Lutensol AT 50 (15 g) (available from BASF) in water (1635 ml). This mixture is stirred well and sonicated at 90% amplitude for 45 min using Branson Ultrasonicator model 450. This dispersion is microfluidized at least 3 passes at 90 psi to obtain stable dispersion with 8.2% solid content. This pigment dispersion (100 g) is then stirred well. Tetraethoxysilane (8.5 ml) is added and stirred well for a good coating of silane compound on the pigment or to form a fine droplet. Ten drops of 1 N hydrochloric acid is then added to hydrolyze the silane compound and heated to 45° C. for 45 min. Thirty drops of 2N ammonium hydroxide is also added to facilitate the condensation to form silica. At this time, coating occurs to form a thin coating of silica on the pigment surface.

example 2

tion of Carbon Black Pigment

[0041]The above silica coated pigment solution from Example 1 (30 g) is heated to 85° C. under nitrogen. The initiator potassium persulfate (0.075 g) is added followed by the emulsion over a period of 5 min. The emulsion is prepared by mixing styrene, hexyl methacrylate, 3-vinylbenzoid acid and ethylene glycol dimethacrylate in the weight ratio of 20 / 73 / 6 / (2 g) in water (2.5 ml) containing the non-ionic surfactant Lutensol AT 50 (0.05 g). The reaction mixture is heated at 85° C. for 3 h and cooled to obtain encapsulated carbon black particles.

example 3

tion of Magenta Pigment

[0042]The same procedure is followed as described in Examples 1 and 2, except that a Fanal Pink D 4830 pigment is used rather than the Degussa Printex 25 carbon black pigment. Other colored pigments can be likewise prepared in accordance with these or other similar methods.

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Abstract

The present invention is drawn to pigment suspensions, methods of forming pigment suspensions, and ink sets. The pigment suspension can comprise a liquid vehicle and a polymer-encapsulated pigment suspended in the liquid vehicle. The polymer-encapsulated pigment can include a pigment core, a passivation layer of an alkoxy metal deposited on a surface of the pigment core, and a polymer encapsulation layer attached to or deposited on the passivation layer.

Description

BACKGROUND OF THE INVENTION[0001]There are several reasons that ink-jet printing has become a popular way of recording images on various media surfaces, particularly paper and photo media substrates. Some of these reasons include low printer noise, capability of high-speed recording, and capability of multi-color recording. Additionally, these advantages can be obtained at a relatively low price to consumers. With respect to ink-jet ink chemistry, the majority of commercial ink-jet inks are water-based. Thus, their constituents are generally water-soluble, as in the case with many dyes, or water dispersible, as in the case with pigments. Furthermore, ink-jet inks have low viscosity to accommodate high frequency jetting and firing chamber refill processes common to ink-jet architecture.[0002]With specific reference to pigment-based ink-jet inks, latex-containing ink-jet inks, and / or polymer-encapsulated pigments, there are special difficulties associated with maintaining appropriate ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/00C08K9/00
CPCC08K9/10C09B67/0013C09D11/322C09D11/40
Inventor GANAPATHIAPPAN, SIVAPACKIA
Owner HEWLETT PACKARD DEV CO LP
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